so, what i'm getting from all this is that it is better to coast in gear for various reasons. the one that catches my attention is that by doing that the injectors cut off the fuel going to the engine, so the cylinders aren't firing. When coasting in neutral the engine goes down to idle which means the injector is sending fuel to the cylinders and some gas is actually being used.
therefore, at least in theory according to the posts in this topic, it is cheaper on gas to coast in gear instead of coasting in neutral. i had no idea the engine could actually run without there being gas being ignited in the cylinders.
this brings up a question. theoretically, can you turn the ignition to the off position and coast in gear? wouldn't this make sense since there's no gas flowing into the cylinders? i know that it would affect other parts of the engine like power steering and braking, but consider just the motor.
now, back to the argument about engine momentum. i still agree that if you coast in gear and have to slam on the brakes that you would be braking against the velocity and the engine rotation because engine can decel only at a certain rate. if you brake at a greater rate than the engine can decel than you are actually also braking against the engine momentum. which would make sense to put the clutch in for slam braking, right? please clarify.
